·HighSpeedBitErrorRateTesterforsynclinks·Dataratesfrom32kbpsto2.048Mbps·Severaltestpatterns·Internalorexternalclocking·Interfacemodules:V.35,X.21,RS-530,V.24/RS-232,G.703-2.048Mbps(unframed),G.703-1.544Mbps(unframed),G.703-64kbps·SimplestraightforwardoperationDESCRIPTION·HBTisaBitErrorRateTesterfortestingsynchronousmodemsandotherDCEs.·HBToperatesatdataratesfrom32kbpsto2.048Mbps,including1.544Mbps,andsupportingallnx56kbpsandnx64kbpsdatarates.·WhentestingaDCE,aloopisperformed,sendingthedatabacktoHBT.HBTcomparesthereceivedpatternwiththetran***ittedpatternandpresentstheresultonanLCDdisplay,countingbiterrors,synclossnumber,blockerrorsanderror-seconds.HBTalsofeaturesanINJECTERRORpushbuttonwhichenablestheusertocheckthetesterandthelinebyintroducingerrorsinthetran***itteddatastream.·Fivetestpatternsare***ailable:511pseudo-random,2047pseudo-random,7space1mark,7mark1spaceandalternatingmark/space.Blocksizecanbesetto512bits,1000bits,1024bits,2048bitsand10kbits.·HBTcangenerateitsownclockorreceiveclockfromtheconnectedDCE.·HBTsupportsthefollowinginterfaces:V.35,X.21,RS-530,RS-232,G.703-2048Mbps,G.703-1.544MbpsandG.703-64kbpsbymeansoffield-replaceablemodules(seeOrdering).Modulereplacementisstraightforwardandsimple.·SetupandoperationareinitiatedfromthefrontpanelusingsoftkeysandinteractivemenuselectiononanLCDmessagedisplay.TenLEDindicatorsdisplaytheactivityoftheinterfacesignals.·HBTissuppliedinaconvenienthand-heldcase.Itispoweredbyadetachableexternalpowersupply)